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Holden HSV Senator Engine Number
Use this guide to locate the engine number on your Holden HSV Senator and line up the right engine-related parts enquiry.
The HSV Senator was Holden Special Vehicles' luxury-oriented V8 performance sedan, built on the Commodore and produced across the VN to VF era, most often sold in later years as the Senator Signature that paired V8 muscle with a higher level of luxury equipment than the Clubsport.
Where to find your Holden engine number
The stamped engine number is on a machined pad on the block. Its location depends on the engine family:
- Inline six-cylinder: on a pad on the right-hand side of the block, above the engine-mount boss.
- V8 (253 / 308, 4.2 / 5.0 litre): on a pad on the left-hand side of the block, above the engine mounting.
- V6 (Buick-derived, Ecotec, Alloytec): on the front left-hand face of the block, below the ignition coil.
- Later V6 and LS V8 models: the build / engine plate sits on the radiator support panel (VT-VZ era) or the passenger-side strut tower (VE / VF era).
You may need to wipe the pad clean to read the stamped number, and on air-conditioned cars the compressor can sit in front of it. Older Holden engines use a capacity-plus-tune prefix (for example 186S or a Q-series V8 code), while modern engines (Ecotec, Alloytec and the LS V8 family) use a GM engine code plus a separate stamped serial.
For the most accurate part match, send us both the engine code or prefix and the full stamped number, along with whether the car is automatic or manual.
On this model
The Senator was V8-powered throughout, using the 5.0-litre V8 in the earlier VN-VS era before moving to the Gen III/Gen IV LS-family engines – LS1, then LS2 and later LS3 – across the VT to VF period. To match engine parts correctly, quote the exact HSV series, the V8 engine family and the stamped engine number, since specification and tune varied by generation and were often to HSV's own settings. The move from the 5.0-litre to the LS engines is the key dividing line, so confirm which V8 the car left the factory with rather than assuming from the model name alone. Where the engine's identity is unclear, verify the stamped number and HSV build details before ordering, as HSV V8 specifications differ from the equivalent base Commodore.
This page also draws on later year-by-year data for Holden Senator to cover modern variants.
Frequently asked questions
Where is the engine number on a Holden HSV Senator?
It is stamped on a machined pad on the engine block. Inline sixes are on the right side above the engine mount, the 253/308 V8s on the left side above the mount, and the V6 engines on the front left face below the ignition coil. You may need to wipe the pad clean to read it.
What is the difference between an engine prefix and an engine code?
Older Holden engines use a capacity-plus-tune prefix stamped on the block, while modern engines (Ecotec, Alloytec and the LS V8 family) use a GM engine code plus a separate stamped serial.
Do you match engine numbers to parts?
Yes. Send us the engine code or prefix and the full stamped number, plus whether the car is automatic or manual, and we will match the right engine-related part.
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